It is used in the Citrix virtualization software wherein the .xbk files refers to backup files the software created. These files are used to store virtual server host configuration files so that it would be easy for users to restart and restore the application in case it bugs down. Even if these files are backup files for a virtual server host, it is not used for virtual machines that run on servers. Xencenter can be used to create these files and open them. 

The application associated with the .xbk file extension is the Smart Notebook software, a program that allows users to easy create classroom lessons. The .xbk files used by this software are mostly images, diagrams, notes, videos and audio wherein they contribute a lot for the storage and distribution of classroom notes.  Converting these files to the latest notebook format and exporting them to .HTML or .PDF files are possible as well.

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